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Warning of the dangers when businesses need to change the humor often measure the customer's long-term effective help businesses avoid perfusion reduce sales status. If it is very long, the level of customer, can be used to predict these years of sales, so sometimes very long to reduce the level of warning signs, sales may decline, forcing enterprises to pay attention to their own experience to the customer, find out the reasons, and how to overcome the long decline in the level of customers is reduced
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